First of all, i'm sorry if i post this on the wrong section, and i'm sorry for using text colors. i meant to make you notice easier what i did, and/or the conditions of the blackberry

I got my first blackberry today. my granpa gave it to me. it was inside a box, it was in an ON condition (showing it's home screen), without any sim card. So, I turned it off (by holding the End Call button and put my sim card in the slot. But when I turn it on again, I get Error 507 mostly, and sometimes 561, Reload Software if i'm not mistaken, and it won't turn off. i have to remove the battery in order to turn it off, but when i put it back on, it automatically turns on, goes to the BlackBerry loading screen, and displays the error message.

I've read a few articles about this error. It's because there's no OS in the phone. However, my phone was freshly bought

i've also read a few articles (some on this site) on how to fix them but since i'm new to blackberries, i couldn't understand them.

i'm eyeing on this article here
What to do next if Jl cmder will not connect

but i'm not quite sure if that's for error 507/561 since there are no text saying "error 507/561" in the article

If it was on in the box, it might not be brand new. Normally BlackBerrys come with the battery uninstalled and when you first open the box you must put in the SIM card, memory card, and battery. Exchange it for one in a sealed box.